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The Use of Real Time Ultrasound Feedback in Teaching Abdominal Hollowing Exercises

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified November 2001 by National Center for Research Resources (NCRR).
Recruitment status was:  Active, not recruiting
ClinicalTrials.gov Identifier:
First Posted: June 2, 2000
Last Update Posted: December 9, 2005
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
National Center for Research Resources (NCRR)

Recently, physical therapists have begun treating people who have mechanical low back pain, hypothesized to be caused by segmental instability in the lumbar spine, with a very specific exercise program consisting of trunk stabilization exercises. The theory behind the use of trunk stabilization exercises to treat lower back pain is that active contraction of the trunk local segmental muscles helps to control inter-segmental movement in the spine. The initial trunk stabilization exercise that physical therapists teach patients is an abdominal drawing in maneuver often called an abdominal hollowing exercise (AHE). A challenge for physical therapists is to establish the most effective means of teaching people to contract the relevant muscles needed to perform the AHE. The purpose of this study is to examine if supplementing the typical clinical instruction for teaching the AHE with visual ultrasound feedback to the patient is effective at reducing the length of time it takes an individual to learn to perform an AHE.

Three groups of research volunteers will be taught how to do the AHE while receiving different kinds of feedback about their performance in order to determine which type of feedback is most effective in assisting people to learn the AHE. Group 1 will not receive any feedback about performance; Group 2 will receive feedback from palpation and verbal descriptive alone; and Group 3 will receive feedback from palpation, verbal descriptive feedback, and real time ultrasound. For the initial test when subjects are learning the AHE, the number of trials until the subject demonstrates his/her third correct AHE will be the outcome variable. For the retention test, the outcome variable will be the percentage of trials (out of ten) of correctly performed AHEs in the absence of visual, verbal or palpation feedback.

Condition Intervention Phase
Low Back Pain Device: Visual utrasound feedback Procedure: Abdominal Hollowing Exercise Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by National Center for Research Resources (NCRR):


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy volunteers
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00005771

United States, Vermont
University of Vermont
Burlington, Vermont, United States, 05401
Sponsors and Collaborators
National Center for Research Resources (NCRR)
  More Information

ClinicalTrials.gov Identifier: NCT00005771     History of Changes
Other Study ID Numbers: NCRR-M01RR00109-0746
M01RR000109 ( U.S. NIH Grant/Contract )
First Submitted: June 1, 2000
First Posted: June 2, 2000
Last Update Posted: December 9, 2005
Last Verified: November 2001

Keywords provided by National Center for Research Resources (NCRR):
Abdominal Hollowing Exercises

Additional relevant MeSH terms:
Back Pain
Low Back Pain
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms